<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Document</title>
  </head>
  <body>
    <script>
      var arr = [80, 75, 69, 95, 92, 88, 76];
      console.log(arr.length);	// 输出结果：7
    </script>
  </body>
</html>